Real estate heir and murder suspect Robert Durst returned to a New Orleans courtroom Thursday for a hearing on charges for which he was arrested in Louisiana. The hearing was delayed after FBI agents failed to appear in court.

Magistrate Judge Harry Cantrell heard arguments Thursday in the case. Cantrell reluctantly agreed to the delay and set another hearing for next Thursday.

An assistant U.S. attorney told Cantrell that two federal agents and a state trooper assigned to a federal task force were instructed not to testify because more time was needed for a review of their subpoenas.

Durst, 71, has been in custody in Louisiana since his arrest in March at the J.W. Marriott hotel in New Orleans.

An attorney for Durst on Wednesday filed a motion to quash, claiming that the warrant to search his client's hotel room was "invalid" and "unlawful."

Attorneys also argued that Louisiana statute regarding the illegal possession of a firearm by a convicted felon does not apply to Durst because his past offense is not specified by the state law.

Durst was originally arrested on a murder warrant out of California for the death of Susan Berman in 2000. His high-profile case resurfaced with the culmination of an HBO documentary series centered on the allegations against him.

Authorities in California said Berman, Durst's friend, was shot in the head in her home in Beverly Hills before police could question her about the disappearance of Durst's first wife in 1982. His attorney said his client's extradition to Los Angeles to face the murder charge is being delayed by the new charges filed by the Louisiana State Police.

Court documents detail the drug and gun charges filed by the LSP. The evidence discovered in his hotel room was unclear until the search warrant was released. According to authorities, the items included:

- Approximately $42,631

- $100 bills packed in small envelopes

- Loaded Smith & Wesson .38 caliber revolver

- One spent shell casing, four live rounds

- Rubber/latex mask

- Marijuana

Investigators said Durst had been withdrawing large sums of money from his bank accounts, most often daily withdrawals of $9,000, over a period of 35 days since October 2014. The real estate heir has an approximate net worth of $100 million and "therefore has the means to flee outside the U.S.," according to documents.